<?php

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014-2019 British Columbia Institute of Technology
 * Copyright (c) 2019-2020 CodeIgniter Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package    CodeIgniter
 * @author     CodeIgniter Dev Team
 * @copyright  2019-2020 CodeIgniter Foundation
 * @license    https://opensource.org/licenses/MIT	MIT License
 * @link       https://codeigniter.com
 * @since      Version 4.0.0
 * @filesource
 */

namespace CodeIgniter\HTTP;

/**
 * Expected behavior of an HTTP request
 *
 * @mixin \CodeIgniter\HTTP\IncomingRequest
 * @mixin \CodeIgniter\HTTP\CLIRequest
 * @mixin \CodeIgniter\HTTP\CURLRequest
 */
interface RequestInterface
{

	/**
	 * Gets the user's IP address.
	 *
	 * @return string IP address
	 */
	public function getIPAddress(): string;

	//--------------------------------------------------------------------

	/**
	 * Validate an IP address
	 *
	 * @param string $ip    IP Address
	 * @param string $which IP protocol: 'ipv4' or 'ipv6'
	 *
	 * @return boolean
	 */
	public function isValidIP(string $ip, string $which = null): bool;

	//--------------------------------------------------------------------

	/**
	 * Get the request method.
	 *
	 * @param boolean $upper Whether to return in upper or lower case.
	 *
	 * @return string
	 */
	public function getMethod(bool $upper = false): string;

	//--------------------------------------------------------------------

	/**
	 * Fetch an item from the $_SERVER array.
	 *
	 * @param  string $index  Index for item to be fetched from $_SERVER
	 * @param  null   $filter A filter name to be applied
	 * @return mixed
	 */
	public function getServer($index = null, $filter = null);

	//--------------------------------------------------------------------
}